Triangle from Two Sides and Angle calculator.
Find the third edge and area from two measured edges and their included angle.
Your inputs
Use measurements from your plan and properties from your chosen product. Any prefilled values are illustrative.
A clear estimate starts here.
Enter your dimensions and product details to see the quantity and purchase breakdown.
Formula and assumptions
How this calculation works.
The entered angle must be between the two entered edges.
A worked example
Illustrative inputs only. Product properties and design dimensions are not recommendations for your project.
- First edge
- 3 m
- Second edge
- 4 m
- Included angle, degrees
- 90
Triangle area: 6 m²
Before you purchase
Use dimensions from your plan and properties from your chosen product. Any design spacing, section or fixing pattern must already be specified.
The entered angle must be between the two entered edges.
Method: dimensional arithmetic and user-supplied specifications. Software checks: 2026-10-04. Calculation and review policy.